import axios from "axios";
import { ElNotification, ElMessageBox, ElMessage, ElLoading } from "element-plus";
import { getToken } from "@/utils/auth";
import errorCode from "@/utils/errorCode";
import { tansParams, blobValidate } from "@/utils/baiyu";
import cache from "@/plugins/cache";
import { saveAs } from "file-saver";
import useUserStore from "@/store/modules/user";

let downloadLoadingInstance;
// 是否显示重新登录
export let isRelogin = { show: false };

axios.defaults.headers["Content-Type"] = "application/json;charset=utf-8";
// 创建axios实例
const service = axios.create({
    // axios中请求配置有baseURL选项，表示请求URL公共部分
    baseURL: import.meta.env.VITE_APP_BASE_API,
    // 超时
    timeout: 10000,
});

// request拦截器
service.interceptors.request.use(
    (config) => {
        // 是否需要设置 token
        const isToken = (config.headers || {}).isToken === false;
        // 是否需要防止数据重复提交
        const isRepeatSubmit = (config.headers || {}).repeatSubmit === false;
        if (getToken() && !isToken) {
            config.headers["Authorization"] = "Bearer " + getToken(); // 让每个请求携带自定义token 请根据实际情况自行修改
        }
        // get请求映射params参数
        if (config.method === "get" && config.params) {
            let url = config.url + "?" + tansParams(config.params);
            url = url.slice(0, -1);
            config.params = {};
            config.url = url;
        }
        if (!isRepeatSubmit && (config.method === "post" || config.method === "put")) {
            const requestObj = {
                url: config.url,
                data: typeof config.data === "object" ? JSON.stringify(config.data) : config.data,
                time: new Date().getTime(),
            };
            const requestSize = Object.keys(JSON.stringify(requestObj)).length; // 请求数据大小
            const limitSize = 5 * 1024 * 1024; // 限制存放数据5M
            if (requestSize >= limitSize) {
                console.warn(`[${config.url}]: ` + "请求数据大小超出允许的5M限制，无法进行防重复提交验证。");
                return config;
            }
            const sessionObj = cache.session.getJSON("sessionObj");
            if (sessionObj === undefined || sessionObj === null || sessionObj === "") {
                cache.session.setJSON("sessionObj", requestObj);
            } else {
                const s_url = sessionObj.url; // 请求地址
                const s_data = sessionObj.data; // 请求数据
                const s_time = sessionObj.time; // 请求时间
                const interval = 1000; // 间隔时间(ms)，小于此时间视为重复提交
                if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
                    const message = "数据正在处理，请勿重复提交";
                    console.warn(`[${s_url}]: ` + message);
                    return Promise.reject(new Error(message));
                } else {
                    cache.session.setJSON("sessionObj", requestObj);
                }
            }
        }
        return config;
    },
    (error) => {
        console.log(error);
        Promise.reject(error);
    }
);

// 响应拦截器
service.interceptors.response.use(
    (res) => {
        // 未设置状态码则默认成功状态
        const code = res.data.code || 200;
        // 获取错误信息
        const msg = errorCode[code] || res.data.msg || errorCode["default"];
        // 二进制数据则直接返回
        if (res.request.responseType === "blob" || res.request.responseType === "arraybuffer") {
            return res.data;
        }
        if (code === 401) {
            if (!isRelogin.show) {
                isRelogin.show = true;
                ElMessageBox.confirm("登录状态已过期，您可以继续留在该页面，或者重新登录", "系统提示", {
                    confirmButtonText: "重新登录",
                    cancelButtonText: "取消",
                    type: "warning",
                })
                    .then(() => {
                        isRelogin.show = false;
                        useUserStore()
                            .logOut()
                            .then(() => {
                                location.href = "/index";
                            });
                    })
                    .catch(() => {
                        isRelogin.show = false;
                    });
            }
            return Promise.reject("无效的会话，或者会话已过期，请重新登录。");
        } else if (code === 500) {
            ElMessage({ message: msg, type: "error" });
            return Promise.reject(new Error(msg));
        } else if (code === 601) {
            ElMessage({ message: msg, type: "warning" });
            return Promise.reject(new Error(msg));
        } else if (code !== 200) {
            ElNotification.error({ title: msg });
            return Promise.reject("error");
        } else {
            return Promise.resolve(res.data);
        }
    },
    (error) => {
        console.log("err" + error);
        let { message } = error;
        if (message == "Network Error") {
            message = "后端接口连接异常";
        } else if (message.includes("timeout")) {
            message = "系统接口请求超时";
        } else if (message.includes("Request failed with status code")) {
            message = "系统接口" + message.substr(message.length - 3) + "异常";
        }
        ElMessage({ message: message, type: "error", duration: 5 * 1000 });
        return Promise.reject(error);
    }
);

// 通用下载方法
export function download(url, params, filename, config) {
    downloadLoadingInstance = ElLoading.service({ text: "正在下载数据，请稍候", background: "rgba(0, 0, 0, 0.7)" });
    return service
        .post(url, params, {
            transformRequest: [
                (params) => {
                    return tansParams(params);
                },
            ],
            headers: { "Content-Type": "application/x-www-form-urlencoded" },
            responseType: "blob",
            ...config,
        })
        .then(async (data) => {
            const isBlob = blobValidate(data);
            if (isBlob) {
                const blob = new Blob([data]);
                saveAs(blob, filename);
            } else {
                const resText = await data.text();
                const rspObj = JSON.parse(resText);
                const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode["default"];
                ElMessage.error(errMsg);
            }
            downloadLoadingInstance.close();
        })
        .catch((r) => {
            console.error(r);
            ElMessage.error("下载文件出现错误，请联系管理员！");
            downloadLoadingInstance.close();
        });
}

export default service;
